In recent servers provided by my client's hosting provider, the
/etc/apt/sources.list file contains references to:
deb http://ubuntu/ubuntu/ xenial main restricted ... deb http://ubuntu-secu/ubuntu xenial-security multiverse
while previous servers contained lines that I'm used to see:
deb http://fr.archive.ubuntu.com/ubuntu/ xenial main restricted ... deb-src http://security.ubuntu.com/ubuntu/ xenial-security multiverse
This particular url doesn't seem to resolve, yet the upgrades seem to work.
Is this something provided by Ubuntu itself?
If not, what is the explanation and where can it likely be defined?